Use Crayola Colored Pencils and Crayola Gel Markers to add texture to your buildings' exterior walls. Draw horizontal lines to look like siding or curved designs to look like fancy moldings. For texture such as bricks, place your paper on top of flat textural materials (door mats, sandpaper, or netting, for example) and rub over the paper with the side of an unwrapped Crayola Crayon. Glue the building exteriors to the boxes with Crayola School Glue. Dry.